Some times you may wanted to add mail enabled public folder as the member of Distrubution list and you wanted to send copy of mail to PF which is sent to distrubution list. For this you may need to add mail enabled public folder as the member of the DL
Its not possible add public folder as members of DL in Exchange 2003. This can be only done from Exchagne 2007.
Throught Exchange 2007 you can add both throught Exchange management console and Powershell command
Powershell command
Add-DistributionGroupMember -Identity “DLName” -Member “Email address”
Exchange Management console
Expand Recipient Configuration -> Distibution Group -> find the requied DL -> Add the same
SMTP Port 25 
Aside of a command-line option, to add a mail-enabled public folder to a distribution list in Exchange 2003, you have to approach it from the public folder side of things instead of from the distribution list.
Open Exchange 2003 System Manager and traverse to the Administative Group you’re interested in. Open Folders -> Public Folders and select the mail enabled public folder there. Open the properties pane for that folder and select the “Member Of” tab. Simply “Add…” the distribution list from there.
Thank you very much Blarg!
Is this really work?? No email were forwarded to the Public Folder. What have I missed?